how to mock laravel eloquent model - unit-testing

Question

I keep fumbling over this - how do I mock a model that extends form Eloquent in Laravel 4 for my unit test?
I keep getting the following error w/ my current way
ErrorException: Trying to get property of non-object
Example
use \Repository\Text\EloquentText;
use \Faker\Factory as Faker;
class EloquentTextTest extends TestCase {
public function setUp()
{
parent::setUp();
$stub = $this->getMock('Text');
$stub->expects($this->any())->method('save');
$this->_fixture = new EloquentText($stub);
}
/**
* #test
*/
public function createShouldCreateNewTextEntry()
{
$faker = Faker::Create();
$data = [
'title' => $faker->sentence,
'content' => $faker->text,
'level_id' => $faker->randomDigit,
'is_public' => $faker->numberBetween(0, 1),
'is_visible' => $faker->numberBetween(0, 1),
];
$text = $this->_fixture->create($data);
$this->assertEquals($data['title'], $text->title);
$this->assertEquals($data['content'], $text->content);
$this->assertEquals($data['level_id'], $text->level_id);
$this->assertEquals($data['is_public'], $text->is_public);
$this->assertEquals($data['is_visible'], $text->is_visible);
return $text;
}